2005 Yamaha YBR125ED Service Manual
Complete service documentation for the 2005 Yamaha YBR125ED. Features 336 pages of detailed engine, chassis, electrical, and carburetor repair procedures with torque specifications and troubleshooting. Original Yamaha factory manual.
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Models Covered & Key Technical Specifications
Yamaha YBR125ED (3D9-F8197-E0) — 2005 Systematic Manufacturer Overview | YBR125ED Series Portfolio.
- Authorized Throughput Data: 123.7 cm³ (7.55 cu.in) is configured at the engine displacement capacity Architecture.
- Critical Angular Speed: For optimal performance, 10.0:1 produces the compression ratio Threshold.
- Operational Package Size: 1,200 kPa (12.0 kgf/cm², 170.7 psi) maintains the standard compression pressure Mapping.
- Fundamental Moment Values: 12.0 L (2.64 Imp gal, 3.17 US gal) is established at the fuel tank capacity Configuration.
- Specific Fit Tolerances: 1.20 L (1.06 Imp qt, 1.27 US qt) is set to the total engine oil capacity Benchmarks.
- Maximum Speed Rating: 0.6 ~ 0.7 mm (0.024 ~ 0.028 in) requires the spark plug gap range Standards.
Professional Workshop Service Manual & Technical Specifications
Industrial Electrical Manual: Motorcycle Yamaha YBR125ED Manual - Precision Maintenance & Diagnostic Guide Assembly-Guide
Performance-Values: YBR125ED (2005) // Calibration-Scope: Engine and transmission systems service Logic // Performance-Values: Comprehensive technical resource documentation.
| Documentation Component | System Coverage | Reference Source |
|---|---|---|
| Electrical Schematics | Complete ignition, charging, and lighting circuits | Circuit diagrams included |
| Powertrain Procedures | Engine disassembly through transmission assembly | Chapters 5-6 |
| Diagnostic Reference | Starting, fuel, and electrical troubleshooting | Chapter 8 |
The documentation provides guidance on engine systems and carburetor procedures, covers chassis suspension and brake components, and includes electrical system and transmission service information.
Operational Benchmarks
Maintenance guidelines are included for engine oil changes, brake adjustments, and tire pressure verification. The manual documents specifications for the YBR125ED's 123.7 cm³ single-cylinder 4-stroke engine, including fuel system configuration with 12.0 L tank capacity. Crankshaft and balancer assembly procedures are detailed across multiple sections, with exploded diagrams clarifying component relationships and removal sequences.
Precise Standard
OEM guidelines are included for clutch cable free play adjustment (10-15 mm at the pivot bolt), throttle cable free play (3-7 mm at the grip flange), and rear brake pedal positioning. The document references torque specifications for fastener tightening across all major systems, covering front fork assembly, steering head components, and chassis mountings. Valve clearance data is documented for both intake (0.08-0.12 mm cold) and exhaust (0.10-0.14 mm cold) positions.
Advanced Sequences
Transmission service information covers the constant-mesh 5-speed transmission with detailed shift fork and shift drum component identification. The manual provides shift drum segment inspection criteria, transmission gear dog wear assessment procedures, and main/drive axle runout measurement methods. Electrical circuit troubleshooting guides address ignition system diagnostics, starting circuit operation, and battery charging system verification protocols.
Modular Methodology
The document covers periodic maintenance schedules at 1,000, 6,000, 12,000, 18,000, and 24,000 km intervals, alongside annual inspection requirements. Component lubrication points are systematically mapped with specific lubricant types (engine oil, molybdenum-disulfide grease, lithium-soap-based compounds). Front fork assembly procedures detail spring installation, damper rod positioning, and oil level adjustment sequences for both suspension legs.
Core Threshold
The manual documents torque specifications for the crankshaft carrier bolts to ensure proper connecting rod fit. Brake system sections include front disc brake caliper assembly, rear drum brake shoe plate configuration, and hydraulic brake system bleeding procedures. Fuel system data covers carburetor jet sizing (#97.5 main jet), pilot screw adjustment (1-1/2 turns out), and float chamber fuel level specifications (6.0-7.0 mm below mating surface).
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